| 摘要 |
<p>Pyrocatechin derivatives of formula I wherein R illustrates a group of formulae Ia, Ib, Ic or Id R<sub>1</sub> is 4-halogen-but-2-enyl, R<sub>2</sub> is lower alkyl or cycloalkyl, R<sub>3</sub> is lower alkoxy and R<sub>4</sub> is lower alkoxy lower alkoxy, or, where R is a group of formula (Ia), it is hydroxy, hydroxy lower alkoxy or a group of formula Ie R<sub>5</sub> is reactive esterified hydroxy, R<sub>6</sub> is azido and R<sub>7</sub> is lower alkyl, lower alkenyl, cycloalkyl or aryl lower alkyl, and their salts, are valuable intermediates in the production of active ingredients for medicaments.</p> |
